BaseFortify

Publication date: 2025-11-13

Last updated on: 2026-07-05

Assigner: MITRE

Description

A stack buffer overflow exists in the ToToLink A720R Router firmware V4.1.5cu.614_B20230630 within the sysconf binary (sub_401EE0 function). The binary reads the /proc/stat file using fgets() into a local buffer and subsequently parses the line using sscanf() into a single-byte variable with the %s format specifier. Maliciously crafted /proc/stat content can overwrite adjacent stack memory, potentially allowing an attacker with filesystem write privileges to execute arbitrary code on the device.

CVSS Scores

EPSS Scores

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Meta Information

Published

2025-11-13

Last Modified

2026-07-05

Generated

2026-07-06

AI Q&A

2025-11-13

EPSS Evaluated

2026-07-05

NVD

CVE-2025-60685

EUVD

EUVD-2025-175311

Affected Vendors & Products

Vendor	Product	Version / Range
totolink	a720r_firmware	4.1.5cu.614_b20230630
totolink	a720r	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-121	A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

Attack-Flow Graph

Executive Summary

This vulnerability is a stack buffer overflow in the ToToLink A720R Router firmware version V4.1.5cu.614_B20230630, specifically in the sysconf binary's sub_401EE0 function. The binary reads data from the /proc/stat file into a local buffer using fgets(), then parses it with sscanf() into a single-byte variable using the %s format specifier. If the /proc/stat content is maliciously crafted, it can overwrite adjacent stack memory, leading to a buffer overflow.

Impact Analysis

An attacker with filesystem write privileges can exploit this vulnerability by providing malicious content in the /proc/stat file, causing a stack buffer overflow. This can potentially allow the attacker to execute arbitrary code on the device, which may lead to unauthorized control or compromise of the router.

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